{"id":1580,"date":"2026-04-07T11:27:06","date_gmt":"2026-04-07T03:27:06","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/asynchronous-design-timing-diagram-embedded-systems\/"},"modified":"2026-04-07T11:27:06","modified_gmt":"2026-04-07T03:27:06","slug":"asynchronous-design-timing-diagram-embedded-systems","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/asynchronous-design-timing-diagram-embedded-systems\/","title":{"rendered":"B\u00f3c T\u00e1ch Truy\u1ec1n Thuy\u1ebft: T\u1ea1i Sao “B\u1ea5t \u0110\u1ed3ng B\u1ed9” Kh\u00f4ng C\u00f3 Ngh\u0129a L\u00e0 “Kh\u00f4ng Th\u1eddi Gian” Trong Thi\u1ebft K\u1ebf Nh\u00fang"},"content":{"rendered":"

Khi c\u00e1c k\u1ef9 s\u01b0 th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang, thu\u1eadt ng\u1eefb\u1ea5t \u0111\u1ed3ng b\u1ed9<\/strong>th\u01b0\u1eddng k\u00edch ho\u1ea1t m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy c\u1ee5 th\u1ec3. Nhi\u1ec1u ng\u01b0\u1eddi cho r\u1eb1ng n\u1ebfu m\u1ed9t thi\u1ebft k\u1ebf l\u00e0 b\u1ea5t \u0111\u1ed3ng b\u1ed9 th\u00ec th\u1eddi gian l\u00e0 kh\u00f4ng quan tr\u1ecdng. H\u1ecd h\u00ecnh dung m\u1ed9t th\u1ebf gi\u1edbi n\u01a1i c\u00e1c t\u00edn hi\u1ec7u thay \u0111\u1ed5i t\u00f9y \u00fd, kh\u00f4ng b\u1ecb r\u00e0ng bu\u1ed9c b\u1edfi \u0111\u1ed3ng h\u1ed3, v\u00e0 ho\u00e0n to\u00e0n t\u1ef1 do kh\u1ecfi c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian. \u0110\u00e2y l\u00e0 m\u1ed9t hi\u1ec3u l\u1ea7m nguy hi\u1ec3m. Tr\u00ean th\u1ef1c t\u1ebf, thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 g\u1eafn b\u00f3 s\u00e2u s\u1eafc v\u1edbi th\u1eddi gian. N\u00f3 ch\u1ec9 l\u00e0 m\u1ed9t c\u00e1ch kh\u00e1c \u0111\u1ec3 qu\u1ea3n l\u00fd th\u1eddi gian. Vi\u1ec7c hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 ai l\u00e0m vi\u1ec7c v\u1edbi s\u01a1 \u0111\u1ed3 th\u1eddi gian, \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u hay ki\u1ebfn tr\u00fac ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng th\u1ea5p.<\/p>\n

Th\u1ef1c t\u1ebf l\u00e0 r\u00f5 r\u1ec7t:th\u1eddi gian l\u00e0 m\u1ed9t h\u1eb1ng s\u1ed1 v\u1eadt l\u00fd<\/strong> trong \u0111i\u1ec7n t\u1eed. C\u00e1c electron m\u1ea5t th\u1eddi gian \u0111\u1ec3 di chuy\u1ec3n qua d\u00e2y d\u1eabn. C\u00e1c c\u1ed5ng logic m\u1ea5t th\u1eddi gian \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i. N\u1ebfu b\u1ea1n cho r\u1eb1ng th\u1eddi gian kh\u00f4ng t\u1ed3n t\u1ea1i, b\u1ea1n c\u00f3 nguy c\u01a1 x\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng th\u1ea5t b\u1ea1i m\u1ed9t c\u00e1ch kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc. B\u00e0i vi\u1ebft n\u00e0y ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7 gi\u1eefa t\u00ednh b\u1ea5t \u0111\u1ed3ng b\u1ed9 v\u00e0 th\u1eddi gian, t\u1eadp trung v\u00e0o vi\u1ec7c s\u01a1 \u0111\u1ed3 th\u1eddi gian v\u1eabn l\u00e0 c\u00f4ng c\u1ee5 quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 ki\u1ec3m ch\u1ee9ng, b\u1ea5t k\u1ec3 chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ed3ng h\u1ed3 n\u00e0o \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n

\"Chalkboard-style<\/figure>\n

Sai l\u1ea7m c\u1ed1t l\u00f5i: Th\u1eddi gian so v\u1edbi \u0110\u1ed3ng h\u1ed3 \ud83d\udd70\ufe0f<\/h2>\n

S\u1ef1 nh\u1ea7m l\u1eabn b\u1eaft ngu\u1ed3n t\u1eeb t\u1eeb v\u1ef1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong logic s\u1ed1. Trong thi\u1ebft k\u1ebf \u0111\u1ed3ng b\u1ed9, t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c x\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu. M\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u di chuy\u1ec3n c\u00f9ng nh\u1ecbp. \u0110i\u1ec1u n\u00e0y gi\u00fap d\u1ec5 h\u00ecnh dung th\u1eddi gian. B\u1ea1n nh\u00ecn v\u00e0o c\u1ea1nh \u0111\u1ed3ng h\u1ed3, v\u00e0 b\u1ea1n bi\u1ebft ch\u00ednh x\u00e1c khi n\u00e0o s\u1ef1 ki\u1ec7n ti\u1ebfp theo c\u00f3 th\u1ec3 x\u1ea3y ra.<\/p>\n

Trong thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9, kh\u00f4ng c\u00f3 \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c. Thay v\u00e0o \u0111\u00f3, c\u00e1c t\u00edn hi\u1ec7u c\u1ee5c b\u1ed9 k\u00edch ho\u1ea1t c\u00e1c s\u1ef1 ki\u1ec7n. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n<\/em> ho\u1eb7ct\u1ef1 \u0111\u1ecbnh th\u1eddi<\/em>. V\u00ec kh\u00e1i ni\u1ec7m v\u1ec1 m\u1ed9t “t\u00edch t\u1eafc” bi\u1ebfn m\u1ea5t, m\u1ed9t s\u1ed1 nh\u00e0 thi\u1ebft k\u1ebf hi\u1ec3u sai r\u1eb1ng kh\u00e1i ni\u1ec7m v\u1ec1th\u1eddi l\u01b0\u1ee3ng<\/em>c\u0169ng bi\u1ebfn m\u1ea5t theo. H\u1ecd sai.<\/p>\n

D\u01b0\u1edbi \u0111\u00e2y l\u00e0 s\u1ef1 ph\u00e2n t\u00edch kh\u00e1c bi\u1ec7t:<\/p>\n

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  • Thi\u1ebft k\u1ebf \u0110\u1ed3ng b\u1ed9:<\/strong> Th\u1eddi gian \u0111\u01b0\u1ee3c l\u01b0\u1ee3ng t\u1eed h\u00f3a theo chu k\u1ef3 \u0111\u1ed3ng h\u1ed3. C\u00e1c thao t\u00e1c x\u1ea3y ra t\u1ea1i c\u00e1c c\u1ea1nh.<\/li>\n
  • Thi\u1ebft k\u1ebf B\u1ea5t \u0111\u1ed3ng b\u1ed9:<\/strong> Th\u1eddi gian l\u00e0 li\u00ean t\u1ee5c. C\u00e1c thao t\u00e1c x\u1ea3y ra khi d\u1eef li\u1ec7u \u0111\u1ebfn v\u00e0 qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c ho\u00e0n t\u1ea5t.<\/li>\n<\/ul>\n

    Ngay c\u1ea3 khi kh\u00f4ng c\u00f3 \u0111\u1ed3ng h\u1ed3, c\u00e1c t\u00edn hi\u1ec7u v\u1eabn ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i trong nh\u1eefng kho\u1ea3ng th\u1eddi gian c\u1ee5 th\u1ec3. N\u1ebfu m\u1ed9t t\u00edn hi\u1ec7u \u0111\u1ebfn qu\u00e1 s\u1edbm, b\u1ed9 nh\u1eadn c\u00f3 th\u1ec3 ch\u01b0a s\u1eb5n s\u00e0ng. N\u1ebfu n\u00f3 \u0111\u1ebfn qu\u00e1 mu\u1ed9n, b\u1ed9 nh\u1eadn c\u00f3 th\u1ec3 \u0111\u00e3 chuy\u1ec3n sang tr\u1ea1ng th\u00e1i ti\u1ebfp theo. Nh\u1eefng kho\u1ea3ng th\u1eddi gian n\u00e0y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi s\u01a1 \u0111\u1ed3 th\u1eddi gian. Do \u0111\u00f3, logic b\u1ea5t \u0111\u1ed3ng b\u1ed9 kh\u00f4ng ph\u1ea3i l\u00e0kh\u00f4ng c\u00f3 th\u1eddi gian<\/em>; n\u00f3 l\u00e0\u0111\u01b0\u1ee3c \u0111\u1ecbnh th\u1eddi c\u1ee5c b\u1ed9<\/em>.<\/p>\n

    Th\u1ef1c t\u1ea1i V\u1eadt l\u00fd: Truy\u1ec1n d\u1eabn v\u00e0 \u0110\u1ed9 tr\u1ec5 \u26a1<\/h2>\n

    D\u00f9 ph\u01b0\u01a1ng ph\u00e1p thi\u1ebft k\u1ebf th\u1ebf n\u00e0o \u0111i n\u1eefa, c\u00e1c \u0111\u1ecbnh lu\u1eadt v\u1eadt l\u00fd v\u1eabn \u00e1p d\u1ee5ng. M\u1ed9t c\u1ed5ng logic kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t c\u00f4ng t\u1eafc tr\u1eebu t\u01b0\u1ee3ng. N\u00f3 l\u00e0 m\u1ed9t m\u1ea1ch v\u1eadt l\u00fd \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb c\u00e1c transistor. Khi \u0111i\u1ec7n \u00e1p thay \u0111\u1ed5i, n\u00f3 ph\u1ea3i v\u01b0\u1ee3t qua \u0111i\u1ec7n dung v\u00e0 \u0111i\u1ec7n tr\u1edf. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra\u0111\u1ed9 tr\u1ec5 truy\u1ec1n d\u1eabn<\/strong>.<\/p>\n

    Xem x\u00e9t m\u1ed9t giao th\u1ee9c b\u1eaft tay b\u1ea5t \u0111\u1ed3ng b\u1ed9, ch\u1eb3ng h\u1ea1n nh\u01b0 ph\u01b0\u01a1ng th\u1ee9c Y\u00eau c\u1ea7u-X\u00e1c nh\u1eadn (REQ-ACK). \u0110i\u1ec1u n\u00e0y ph\u1ed5 bi\u1ebfn trong c\u00e1c b\u1ed9 \u0111\u1ec7m FIFO v\u00e0 c\u00e1c giao di\u1ec7n truy\u1ec1n th\u00f4ng.<\/p>\n

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    • Giai \u0111o\u1ea1n Y\u00eau c\u1ea7u:<\/strong>B\u00ean g\u1eedi k\u00edch ho\u1ea1t m\u1ed9t \u0111\u01b0\u1eddng d\u00e2y \u0111\u1ec3 b\u00e1o hi\u1ec7u d\u1eef li\u1ec7u \u0111\u00e3 s\u1eb5n s\u00e0ng.<\/li>\n
    • Giai \u0111o\u1ea1n X\u1eed l\u00fd:<\/strong>B\u00ean nh\u1eadn \u0111\u1ecdc d\u1eef li\u1ec7u v\u00e0 x\u1eed l\u00fd n\u00f3.<\/li>\n
    • Giai \u0111o\u1ea1n X\u00e1c nh\u1eadn:<\/strong>B\u00ean nh\u1eadn g\u1eedi t\u00edn hi\u1ec7u r\u1eb1ng d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn.<\/li>\n
    • Giai \u0111o\u1ea1n \u0110\u1eb7t l\u1ea1i:<\/strong>B\u00ean g\u1eedi ng\u1eaft t\u00edn hi\u1ec7u \u0111\u01b0\u1eddng d\u00e2y \u0111\u1ec3 chu\u1ea9n b\u1ecb cho giao d\u1ecbch ti\u1ebfp theo.<\/li>\n<\/ul>\n

      M\u1ed7i giai \u0111o\u1ea1n trong s\u1ed1 n\u00e0y \u0111\u1ec1u y\u00eau c\u1ea7u m\u1ed9t kho\u1ea3ng th\u1eddi gian c\u1ee5 th\u1ec3. N\u1ebfu b\u00ean g\u1eedi ng\u1eaft y\u00eau c\u1ea7u tr\u01b0\u1edbc khi b\u00ean nh\u1eadn ho\u00e0n to\u00e0n ghi nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u x\u00e1c nh\u1eadn, d\u1eef li\u1ec7u s\u1ebd b\u1ecb h\u1ecfng. \u0110\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 r\u1ee7i ro l\u00fd thuy\u1ebft; \u0111\u00f3 l\u00e0 m\u1ed9t gi\u1edbi h\u1ea1n v\u1eadt l\u00fd. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c kho\u1ea3ng th\u1eddi gian n\u00e0y. Ch\u00fang cho th\u1ea5y \u0111\u1ed9 r\u1ed9ng xung t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u1ea1ch nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c s\u1ef1 thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i.<\/p>\n

      Kh\u00f4ng c\u00f3 \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kho\u1ea3ng an to\u00e0n, nh\u00e0 thi\u1ebft k\u1ebf ph\u1ea3i d\u1ef1a v\u00e0o c\u00e1c m\u00f4 h\u00ecnh tr\u1ec5<\/strong>. C\u00e1c m\u00f4 h\u00ecnh n\u00e0y \u01b0\u1edbc t\u00ednh th\u1eddi gian m\u1ed9t t\u00edn hi\u1ec7u m\u1ea5t \u0111\u1ec3 \u0111i t\u1eeb \u0111i\u1ec3m A \u0111\u1ebfn \u0111i\u1ec3m B. N\u1ebfu tr\u1ec5 b\u1ecb \u0111\u00e1nh gi\u00e1 th\u1ea5p, h\u1ec7 th\u1ed1ng s\u1ebd x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng \u0111ua. N\u1ebfu \u0111\u00e1nh gi\u00e1 qu\u00e1 cao, hi\u1ec7u su\u1ea5t s\u1ebd b\u1ecb gi\u1ea3m. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian bi\u1ec3u di\u1ec5n c\u00e1c tr\u1ec5 n\u00e0y d\u01b0\u1edbi d\u1ea1ng kho\u1ea3ng c\u00e1ch ngang gi\u1eefa c\u00e1c c\u1ea1nh t\u00edn hi\u1ec7u.<\/p>\n

      C\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian trong c\u00e1c h\u1ec7 th\u1ed1ng b\u1ea5t \u0111\u1ed3ng b\u1ed9 \ud83d\udcca<\/h2>\n

      Trong thi\u1ebft k\u1ebf \u0111\u1ed3ng b\u1ed9, s\u01a1 \u0111\u1ed3 th\u1eddi gian tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t l\u01b0\u1edbi. Trong thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9, l\u01b0\u1edbi bi\u1ebfn m\u1ea5t nh\u01b0ng c\u00e1c \u0111\u01b0\u1eddng \u0111o v\u1eabn c\u00f2n. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho giao di\u1ec7n b\u1ea5t \u0111\u1ed3ng b\u1ed9 t\u1eadp trung v\u00e0o c\u00e1c m\u1ed1i quan h\u1ec7 t\u01b0\u01a1ng \u0111\u1ed1i thay v\u00ec c\u00e1c chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 tuy\u1ec7t \u0111\u1ed1i.<\/p>\n

      C\u00e1c y\u1ebfu t\u1ed1 ch\u00ednh c\u1ea7n ph\u00e2n t\u00edch trong s\u01a1 \u0111\u1ed3 th\u1eddi gian b\u1ea5t \u0111\u1ed3ng b\u1ed9 bao g\u1ed3m:<\/p>\n

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      • C\u1ea1nh t\u00edn hi\u1ec7u:<\/strong>C\u00e1c chuy\u1ec3n ti\u1ebfp t\u0103ng v\u00e0 gi\u1ea3m l\u00e0 c\u00e1c \u0111i\u1ec3m k\u00edch ho\u1ea1t. Th\u1eddi \u0111i\u1ec3m ch\u00ednh x\u00e1c l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng.<\/li>\n
      • Th\u1eddi gian gi\u1eef:<\/strong>T\u00edn hi\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh trong bao l\u00e2u sau m\u1ed9t chuy\u1ec3n ti\u1ebfp? Trong h\u1ec7 th\u1ed1ng b\u1ea5t \u0111\u1ed3ng b\u1ed9, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi b\u1ed9 nh\u1edb d\u1ef1a tr\u00ean b\u1ed9 ghi gi\u1eef.<\/li>\n
      • Th\u1eddi gian chu\u1ea9n b\u1ecb:<\/strong>D\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh trong bao l\u00e2u tr\u01b0\u1edbc khi x\u1ea3y ra chuy\u1ec3n ti\u1ebfp? \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o b\u00ean nh\u1eadn c\u00f3 \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 ghi nh\u1eadn gi\u00e1 tr\u1ecb.<\/li>\n
      • Th\u1eddi gian ch\u1ebft:<\/strong>Kho\u1ea3ng th\u1eddi gian kh\u00f4ng c\u00f3 ho\u1ea1t \u0111\u1ed9ng n\u00e0o x\u1ea3y ra gi\u1eefa c\u00e1c giao d\u1ecbch. \u0110i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng.<\/li>\n
      • Giao nhau:<\/strong>Kho\u1ea3ng th\u1eddi gian c\u1ea3 t\u00edn hi\u1ec7u y\u00eau c\u1ea7u v\u00e0 t\u00edn hi\u1ec7u x\u00e1c nh\u1eadn \u0111\u1ec1u ho\u1ea1t \u0111\u1ed9ng. Giao nhau qu\u00e1 m\u1ee9c s\u1ebd g\u00e2y ra xung \u0111\u1ed9t.<\/li>\n<\/ul>\n

        Khi \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, b\u1ea1n \u0111ang t\u00ecm ki\u1ebfm t\u00ednh nh\u00e2n qu\u1ea3<\/strong>. Trong h\u1ec7 th\u1ed1ng c\u00f3 \u0111\u1ed3ng h\u1ed3, t\u00ednh nh\u00e2n qu\u1ea3 \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o b\u1edfi c\u1ea1nh \u0111\u1ed3ng h\u1ed3. Trong h\u1ec7 th\u1ed1ng b\u1ea5t \u0111\u1ed3ng b\u1ed9, t\u00ednh nh\u00e2n qu\u1ea3 \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o b\u1edfi ch\u00ednh c\u00e1c c\u1ed5ng logic. S\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i ch\u1ee9ng minh r\u1eb1ng Nguy\u00ean nh\u00e2n A lu\u00f4n k\u1ebft th\u00fac tr\u01b0\u1edbc khi Hi\u1ec7u \u1ee9ng B b\u1eaft \u0111\u1ea7u.<\/p>\n

        T\u00ecnh tr\u1ea1ng b\u1ea5t \u1ed5n: C\u00e2y c\u1ea7u n\u1ed1i gi\u1eefa c\u00e1c th\u1ebf gi\u1edbi \ud83c\udf09<\/h2>\n

        M\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m quan tr\u1ecdng nh\u1ea5t trong thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 l\u00e0 tr\u1ea1ng th\u00e1i b\u1ea5t \u1ed5n. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi m\u1ed9t t\u00edn hi\u1ec7u thay \u0111\u1ed5i ngay \u0111\u00fang kho\u1ea3nh kh\u1eafc m\u1ed9t ph\u1ea7n t\u1eed l\u01b0u tr\u1eef (nh\u01b0 flip-flop ho\u1eb7c latch) \u0111ang c\u1ed1 g\u1eafng l\u1ea5y m\u1eabu n\u00f3. \u0110\u1ea7u ra kh\u00f4ng ngay l\u1eadp t\u1ee9c x\u00e1c \u0111\u1ecbnh th\u00e0nh 0 ho\u1eb7c 1 h\u1ee3p l\u1ec7. N\u00f3 l\u01a1 l\u1eedng \u1edf tr\u1ea1ng th\u00e1i trung gian.<\/p>\n

        M\u1eb7c d\u00f9 tr\u1ea1ng th\u00e1i b\u1ea5t \u1ed5n th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ea3o lu\u1eadn trong b\u1ed1i c\u1ea3nh chuy\u1ec3n \u0111\u1ed5i gi\u1eefa c\u00e1c mi\u1ec1n \u0111\u1ed3ng h\u1ed3, nh\u01b0ng n\u00f3 l\u00e0 k\u1ebb th\u00f9 ch\u00ednh c\u1ee7a logic b\u1ea5t \u0111\u1ed3ng b\u1ed9 thu\u1ea7n t\u00fay. N\u1ebfu hai t\u00edn hi\u1ec7u b\u1ea5t \u0111\u1ed3ng b\u1ed9 t\u01b0\u01a1ng t\u00e1c m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u00fang c\u00e1ch, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 r\u01a1i v\u00e0o tr\u1ea1ng th\u00e1i m\u00e0 n\u00f3 kh\u00f4ng bi\u1ebft ph\u1ea3i l\u00e0m g\u00ec ti\u1ebfp theo. \u0110\u00e2y l\u00e0 m\u1ed9t l\u1ed7i v\u1ec1 th\u1eddi gian.<\/p>\n

        S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap h\u00ecnh dung c\u00e1c kho\u1ea3ng th\u1eddi gian tr\u1ea1ng th\u00e1i b\u1ea5t \u1ed5n. C\u00e1c k\u1ef9 s\u01b0 ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng kho\u1ea3ng th\u1eddi gian gi\u1eefa m\u1ed9t thay \u0111\u1ed5i t\u00edn hi\u1ec7u v\u00e0 s\u1ef1 ki\u1ec7n l\u1ea5y m\u1eabu ti\u1ebfp theo l\u1edbn h\u01a1n th\u1eddi gian gi\u1ea3i quy\u1ebft<\/strong>. \u0110\u00e2y l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian. N\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 t\u00f9y ch\u1ecdn. B\u1ecf qua \u0111i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn treo h\u1ec7 th\u1ed1ng ho\u1eb7c h\u1ecfng d\u1eef li\u1ec7u.<\/p>\n

        Chi\u1ebfn l\u01b0\u1ee3c x\u00e1c minh: Ch\u1ee9ng minh t\u00ednh \u0111\u00fang \u0111\u1eafn v\u1ec1 th\u1eddi gian \ud83d\udd0d<\/h2>\n

        L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c minh r\u1eb1ng m\u1ed9t thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c \u0111\u1ecbnh th\u1eddi \u0111\u00fang? B\u1ea1n kh\u00f4ng th\u1ec3 ch\u1ec9 d\u1ef1a v\u00e0o m\u00f4 ph\u1ecfng, v\u00ec m\u00f4 ph\u1ecfng s\u1eed d\u1ee5ng c\u00e1c m\u00f4 h\u00ecnh l\u00fd t\u01b0\u1edfng. B\u1ea1n c\u1ea7n ph\u00e2n t\u00edch t\u0129nh v\u00e0 ki\u1ec3m th\u1eed ph\u1ea7n c\u1ee9ng.<\/p>\n

        Ph\u00e2n t\u00edch th\u1eddi gian t\u0129nh (STA)<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c thi\u1ebft k\u1ebf \u0111\u1ed3ng b\u1ed9, nh\u01b0ng \u0111\u00e3 ph\u00e1t tri\u1ec3n. Trong thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9, c\u00e1c c\u00f4ng c\u1ee5 STA ph\u00e2n t\u00edch c\u00e1c \u0111\u01b0\u1eddng d\u1eabn tr\u1ec5 tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t<\/strong> v\u00e0 tr\u1ec5 tr\u01b0\u1eddng h\u1ee3p t\u1ed1t nh\u1ea5t<\/strong> \u0111\u01b0\u1eddng d\u1eabn. Ch\u00fang t\u00ednh to\u00e1n th\u1eddi gian d\u01b0 (slack) cho m\u1ecdi \u0111\u01b0\u1eddng d\u1eabn trong m\u1ea1ch. N\u1ebfu slack \u00e2m, th\u00ec vi ph\u1ea1m v\u1ec1 th\u1eddi gian.<\/p>\n

        C\u00e1c b\u01b0\u1edbc x\u00e1c minh ch\u00ednh bao g\u1ed3m:<\/p>\n

          \n
        • T\u00ednh to\u00e1n tr\u1ec5 \u0111\u01b0\u1eddng d\u1eabn:<\/strong> X\u00e1c \u0111\u1ecbnh tr\u1ec5 t\u1eeb ch\u00e2n \u0111\u1ea7u v\u00e0o \u0111\u1ebfn ch\u00e2n \u0111\u1ea7u ra cho m\u1ecdi \u0111\u01b0\u1eddng d\u1eabn logic.<\/li>\n
        • X\u00e1c \u0111\u1ecbnh r\u00e0ng bu\u1ed9c:<\/strong> X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 r\u1ed9ng xung y\u00eau c\u1ea7u cho c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n.<\/li>\n
        • M\u00f4 h\u00ecnh h\u00f3a t\u1ea3i d\u00e2y d\u1eabn:<\/strong> T\u00ednh \u0111\u1ebfn \u0111i\u1ec7n dung c\u1ee7a c\u00e1c k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c b\u1ea3ng m\u1ea1ch ho\u1eb7c tr\u00ean silicon.<\/li>\n
        • Tr\u01b0\u1eddng h\u1ee3p g\u00f3c:<\/strong> Ki\u1ec3m th\u1eed trong \u0111i\u1ec1u ki\u1ec7n qu\u00e1 tr\u00ecnh ch\u1eadm, \u0111i\u1ec7n \u00e1p th\u1ea5p v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao. Nh\u1eefng \u0111i\u1ec1u ki\u1ec7n n\u00e0y l\u00e0m t\u0103ng tr\u1ec5 t\u1ed1i \u0111a.<\/li>\n
        • Tr\u01b0\u1eddng h\u1ee3p g\u00f3c (nhanh):<\/strong> Ki\u1ec3m th\u1eed trong \u0111i\u1ec1u ki\u1ec7n qu\u00e1 tr\u00ecnh nhanh, \u0111i\u1ec7n \u00e1p cao v\u00e0 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Nh\u1eefng \u0111i\u1ec1u ki\u1ec7n n\u00e0y l\u00e0m gi\u1ea3m tr\u1ec5 t\u1ed1i thi\u1ec3u.<\/li>\n<\/ul>\n

          N\u1ebfu m\u1ed9t thi\u1ebft k\u1ebf v\u01b0\u1ee3t qua x\u00e1c minh \u1edf g\u00f3c ch\u1eadm nh\u01b0ng th\u1ea5t b\u1ea1i \u1edf g\u00f3c nhanh, b\u1ea1n \u0111ang g\u1eb7p \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh. H\u1ec7 th\u1ed1ng qu\u00e1 nhanh so v\u1edbi logic c\u1ee7a ch\u00ednh n\u00f3 \u0111\u1ec3 x\u1eed l\u00fd. S\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i ghi l\u1ea1i c\u1ea3 hai c\u1ef1c \u0111oan.<\/p>\n

          Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong ph\u00e2n t\u00edch th\u1eddi gian \ud83d\udeab<\/h2>\n

          C\u00e1c nh\u00e0 thi\u1ebft k\u1ebf m\u1edbi l\u00e0m quen v\u1edbi ph\u01b0\u01a1ng ph\u00e1p b\u1ea5t \u0111\u1ed3ng b\u1ed9 th\u01b0\u1eddng m\u1eafc ph\u1ea3i nh\u1eefng b\u1eaby c\u1ee5 th\u1ec3. Nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m n\u00e0y gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a thi\u1ebft k\u1ebf.<\/p>\n

            \n
          • B\u1ecf qua tr\u1ec5 d\u00e2y d\u1eabn:<\/strong>Xem c\u00e1c d\u00e2y d\u1eabn nh\u01b0 k\u1ebft n\u1ed1i kh\u00f4ng tr\u1ec5 l\u00e0 tai h\u1ea1i. M\u1ed9t d\u00e2y d\u1eabn l\u00e0 \u0111\u01b0\u1eddng truy\u1ec1n t\u00edn hi\u1ec7u. \u1ede t\u1ed1c \u0111\u1ed9 cao, n\u00f3 t\u1ea1o ra tr\u1edf kh\u00e1ng v\u00e0 ph\u1ea3n x\u1ea1.<\/li>\n
          • Gi\u1ea3 \u0111\u1ecbnh t\u00ednh \u0111\u1ed1i x\u1ee9ng:<\/strong> Gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng con \u0111\u01b0\u1eddng t\u1eeb \u0110\u1ea7u v\u00e0o A \u0111\u1ebfn \u0110\u1ea7u ra B gi\u1ed1ng nh\u01b0 t\u1eeb \u0110\u1ea7u v\u00e0o C \u0111\u1ebfn \u0110\u1ea7u ra D l\u00e0 sai. S\u1ef1 kh\u00e1c bi\u1ec7t trong \u0111\u1ecbnh tuy\u1ebfn t\u1ea1o ra \u0111\u1ed9 l\u1ec7ch th\u1eddi gian.<\/li>\n
          • B\u1ecf qua c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng xung \u0111\u1ed9t:<\/strong> M\u1ed9t c\u1ed5ng logic c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t xung ng\u1eafn m\u00e0 h\u1ec7 th\u1ed1ng hi\u1ec3u nh\u1ea7m l\u00e0 t\u00edn hi\u1ec7u h\u1ee3p l\u1ec7. \u0110\u00e2y l\u00e0 m\u1ed9t nguy c\u01a1. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i hi\u1ec3n th\u1ecb \u0111\u1ed9 r\u1ed9ng c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng xung \u0111\u1ed9t.<\/li>\n
          • S\u1ef1 \u0111\u00e1nh \u0111\u1ed5i gi\u1eefa Ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng v\u00e0 Th\u1eddi gian:<\/strong> Gi\u1ea3m ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 gi\u1ea3m t\u1ea7n s\u1ed1 ho\u1eb7c t\u0103ng \u0111\u1ed9 tr\u1ec5. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 khi\u1ebfn thi\u1ebft k\u1ebf v\u01b0\u1ee3t ra kh\u1ecfi kho\u1ea3ng th\u1eddi gian cho ph\u00e9p.<\/li>\n<\/ul>\n

            So s\u00e1nh: Th\u1eddi gian \u0111\u1ed3ng b\u1ed9 so v\u1edbi th\u1eddi gian b\u1ea5t \u0111\u1ed3ng b\u1ed9 \u2696\ufe0f<\/h2>\n

            \u0110\u1ec3 l\u00e0m r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa hai ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 so s\u00e1nh c\u00e1ch th\u1eddi gian \u0111\u01b0\u1ee3c x\u1eed l\u00fd trong t\u1eebng ph\u01b0\u01a1ng ph\u00e1p. B\u1ea3ng sau \u0111\u00e2y n\u00eau b\u1eadt nh\u1eefng kh\u00e1c bi\u1ec7t quan tr\u1ecdng trong c\u00e1ch qu\u1ea3n l\u00fd th\u1eddi gian.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
            T\u00ednh n\u0103ng<\/th>\nThi\u1ebft k\u1ebf \u0111\u1ed3ng b\u1ed9<\/th>\nThi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9<\/th>\n<\/tr>\n<\/thead>\n
            Tham chi\u1ebfu th\u1eddi gian<\/strong><\/td>\nT\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c<\/td>\nC\u00e1c giao th\u1ee9c x\u00e1c nh\u1eadn \u0111\u1ecba ph\u01b0\u01a1ng \/ S\u1ef1 ki\u1ec7n<\/td>\n<\/tr>\n
            R\u00e0ng bu\u1ed9c th\u1eddi gian<\/strong><\/td>\nChu k\u1ef3 \u0111\u1ed3ng h\u1ed3<\/td>\n\u0110\u1ed9 tr\u1ec5 lan truy\u1ec1n t\u00edn hi\u1ec7u<\/td>\n<\/tr>\n
            C\u00f4ng c\u1ee5 x\u00e1c minh<\/strong><\/td>\nPh\u00e2n t\u00edch mi\u1ec1n \u0111\u1ed3ng h\u1ed3<\/td>\nPh\u00e2n t\u00edch \u0111\u1ed9 tr\u1ec5 \u0111\u01b0\u1eddng \u0111i<\/td>\n<\/tr>\n
            Hi\u1ec7u qu\u1ea3 ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng<\/strong><\/td>\nTi\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng t\u0129nh (dao \u0111\u1ed9ng \u0111\u1ed3ng h\u1ed3)<\/td>\nTi\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng \u0111\u1ed9ng (d\u1ef1a tr\u00ean ho\u1ea1t \u0111\u1ed9ng)<\/td>\n<\/tr>\n
            \u0110\u1ed9 tr\u1ec5<\/strong><\/td>\nD\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c, chu k\u1ef3 c\u1ed1 \u0111\u1ecbnh<\/td>\nThay \u0111\u1ed5i, ph\u1ee5 thu\u1ed9c d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
            R\u1ee7i ro b\u1ea5t \u1ed5n tr\u1ea1ng th\u00e1i<\/strong><\/td>\nTh\u1ea5p (\u0111\u1ed3ng b\u1ed9 h\u00f3a v\u1edbi \u0111\u1ed3ng h\u1ed3)<\/td>\nCao (y\u00eau c\u1ea7u b\u1ed9 \u0111\u1ed3ng b\u1ed9 h\u00f3a)<\/td>\n<\/tr>\n
            \u0110\u1ed9 ph\u1ee9c t\u1ea1p thi\u1ebft k\u1ebf<\/strong><\/td>\nCao (c\u00e2y \u0111\u1ed3ng h\u1ed3)<\/td>\nCao (X\u00e1c minh logic)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            L\u01b0u \u00fd r\u1eb1ng c\u1ea3 hai c\u1ed9t \u0111\u1ec1u y\u00eau c\u1ea7u ph\u00e2n t\u00edch th\u1eddi gian nghi\u00eam ng\u1eb7t. C\u00e1c c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 kh\u00e1c nhau, nh\u01b0ng c\u00e1c y\u00eau c\u1ea7u v\u1eadt l\u00fd v\u1eabn gi\u1eef nguy\u00ean. B\u1ea1n kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi th\u1eddi gian.<\/p>\n

            C\u00e1c Th\u1ef1c H\u00e0nh T\u1ed1t Nh\u1ea5t cho T\u00ednh To\u00e0n V\u1eb9n Th\u1eddi Gian \ud83d\udee1\ufe0f<\/h2>\n

            \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf nh\u00fang c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c, h\u00e3y tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn c\u1ea5u tr\u00fac sau. Nh\u1eefng th\u1ef1c h\u00e0nh n\u00e0y l\u00e0m gi\u1ea3m thi\u1ec3u r\u1ee7i ro vi ph\u1ea1m th\u1eddi gian v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

              \n
            • S\u1eed d\u1ee5ng Th\u01b0 vi\u1ec7n C\u00e9l Chu\u1ea9n:<\/strong>D\u1ef1a v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1eb7c tr\u01b0ng tr\u01b0\u1edbc. Nh\u1eefng th\u01b0 vi\u1ec7n n\u00e0y \u0111i k\u00e8m v\u1edbi d\u1eef li\u1ec7u th\u1eddi gian t\u00ednh \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t.<\/li>\n
            • T\u1ed1i thi\u1ec3u h\u00f3a \u0111\u1ed9 ph\u00e2n nh\u00e1nh:<\/strong>\u0110i\u1ec1u khi\u1ec3n qu\u00e1 nhi\u1ec1u \u0111\u1ea7u v\u00e0o t\u1eeb m\u1ed9t \u0111\u1ea7u ra s\u1ebd l\u00e0m t\u0103ng \u0111i\u1ec7n dung v\u00e0 \u0111\u1ed9 tr\u1ec5. N\u1ebfu c\u1ea7n thi\u1ebft, h\u00e3y d\u00f9ng b\u1ed9 \u0111\u1ec7m cho t\u00edn hi\u1ec7u.<\/li>\n
            • Gi\u1eef c\u00e1c \u0111\u01b0\u1eddng d\u1eabn quan tr\u1ecdng ng\u1eafn:<\/strong>C\u00e1c t\u00edn hi\u1ec7u nh\u1ea1y c\u1ea3m nh\u1ea5t n\u00ean c\u00f3 kho\u1ea3ng c\u00e1ch v\u1eadt l\u00fd ng\u1eafn nh\u1ea5t gi\u1eefa ch\u00fang.<\/li>\n
            • C\u00e2n b\u1eb1ng t\u1ea3i:<\/strong>\u0110\u1ea3m b\u1ea3o r\u1eb1ng logic nh\u00e1nh kh\u00f4ng t\u1ea1o ra m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn nhanh h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi \u0111\u01b0\u1eddng d\u1eabn kh\u00e1c.<\/li>\n
            • T\u00e0i li\u1ec7u h\u00f3a c\u00e1c Gi\u1ea3 \u0111\u1ecbnh Th\u1eddi gian:<\/strong>R\u00f5 r\u00e0ng n\u00eau r\u00f5 \u0111\u1ed9 tr\u1ec5 \u0111\u01b0\u1ee3c gi\u1ea3 \u0111\u1ecbnh cho d\u00e2y d\u1eabn v\u00e0 c\u1ed5ng trong t\u00e0i li\u1ec7u thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u00e1c k\u1ef9 s\u01b0 t\u01b0\u01a1ng lai hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c gi\u1edbi h\u1ea1n.<\/li>\n
            • Th\u1ef1c hi\u1ec7n Ph\u00e1t hi\u1ec7n L\u1ed7i:<\/strong>S\u1eed d\u1ee5ng ki\u1ec3m tra ch\u1eb5n l\u1ebb ho\u1eb7c ki\u1ec3m tra t\u1ed5ng ki\u1ec3m tra. N\u1ebfu x\u1ea3y ra tr\u1ec5 th\u1eddi gian, t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u s\u1ebd l\u00e0 th\u1ee9 \u0111\u1ea7u ti\u00ean b\u1ecb \u1ea3nh h\u01b0\u1edfng. Ph\u00e1t hi\u1ec7n l\u1ed7i s\u1edbm gi\u00fap ng\u0103n ng\u1eeba s\u1ef1 s\u1eadp h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n

              Vai tr\u00f2 c\u1ee7a S\u01a1 \u0111\u1ed3 Th\u1eddi gian trong G\u1ee1 l\u1ed7i \ud83d\udc1e<\/h2>\n

              Khi m\u1ed9t h\u1ec7 th\u1ed1ng th\u1ea5t b\u1ea1i, b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean l\u00e0 xem s\u01a1 \u0111\u1ed3 th\u1eddi gian. Trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng b\u1ed9, b\u1ea1n t\u00ecm c\u00e1c vi ph\u1ea1m v\u1ec1 th\u1eddi gian thi\u1ebft l\u1eadp ho\u1eb7c th\u1eddi gian gi\u1eef so v\u1edbi \u0111\u1ed3ng h\u1ed3. Trong c\u00e1c h\u1ec7 th\u1ed1ng b\u1ea5t \u0111\u1ed3ng b\u1ed9, b\u1ea1n t\u00ecm c\u00e1c vi ph\u1ea1m trong giao th\u1ee9c trao \u0111\u1ed5i t\u00edn hi\u1ec7u.<\/p>\n

              V\u00ed d\u1ee5, n\u1ebfu b\u1ed9 nh\u1eadn b\u1ecf l\u1ee1 m\u1ed9t g\u00f3i d\u1eef li\u1ec7u, s\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd cho th\u1ea5y t\u00edn hi\u1ec7u y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1ee1 b\u1ecf tr\u01b0\u1edbc khi t\u00edn hi\u1ec7u x\u00e1c nh\u1eadn \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t. \u0110\u00e2y l\u00e0 m\u1ed9t \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh<\/strong>. Ng\u01b0\u1eddi g\u1eedi ngh\u0129 r\u1eb1ng \u0111\u00e3 xong, nh\u01b0ng ng\u01b0\u1eddi nh\u1eadn v\u1eabn \u0111ang l\u00e0m vi\u1ec7c.<\/p>\n

              C\u00e1c c\u00f4ng c\u1ee5 g\u1ee1 l\u1ed7i thu th\u1eadp c\u00e1c d\u1ea1ng s\u00f3ng n\u00e0y. Ch\u00fang cho ph\u00e9p b\u1ea1n ph\u00f3ng to \u0111\u1ebfn c\u1ea5p \u0111\u1ed9 nanosecond. B\u1ea1n c\u00f3 th\u1ec3 \u0111o \u0111\u1ed9 tr\u1ec5 ch\u00ednh x\u00e1c gi\u1eefa c\u1ea1nh y\u00eau c\u1ea7u v\u00e0 c\u1ea1nh x\u00e1c nh\u1eadn. N\u1ebfu \u0111\u1ed9 tr\u1ec5 n\u00e0y ng\u1eafn h\u01a1n m\u1ee9c t\u1ed1i thi\u1ec3u m\u00e0 b\u1ed9 nh\u1eadn y\u00eau c\u1ea7u, b\u1ea1n \u0111\u00e3 vi ph\u1ea1m th\u1eddi gian. C\u00e1ch kh\u1eafc ph\u1ee5c l\u00e0 th\u00eam \u0111\u1ed9 tr\u1ec5 ho\u1eb7c thay \u0111\u1ed5i logic.<\/p>\n

              Qu\u00e1 tr\u00ecnh n\u00e0y mang t\u00ednh l\u1eb7p l\u1ea1i. B\u1ea1n \u0111i\u1ec1u ch\u1ec9nh thi\u1ebft k\u1ebf, m\u00f4 ph\u1ecfng l\u1ea1i, v\u00e0 ki\u1ec3m tra s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u1ea7n n\u1eefa. \u0110\u00f3 l\u00e0 m\u1ed9t chu k\u1ef3 tinh ch\u1ec9nh. Kh\u00f4ng c\u00f3 c\u00e1ch ti\u1ebfp c\u1eadn n\u00e0o l\u00e0 \u201cc\u00e0i \u0111\u1eb7t xong r\u1ed3i qu\u00ean \u0111i\u201d trong thi\u1ebft k\u1ebf ph\u1ea7n c\u1ee9ng.<\/p>\n

              T\u1ea1i sao \u0110i\u1ec1u n\u00e0y Quan Tr\u1ecdng \u0111\u1ed1i v\u1edbi C\u00e1c H\u1ec7 Th\u1ed1ng Nh\u00fang Hi\u1ec7n \u0110\u1ea1i \ud83d\udcf1<\/h2>\n

              Khi thi\u1ebft b\u1ecb tr\u1edf n\u00ean nh\u1ecf h\u01a1n v\u00e0 nhanh h\u01a1n, th\u1eddi gian tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n bao gi\u1edd h\u1ebft. Ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng l\u00e0 y\u1ebfu t\u1ed1 ch\u00ednh th\u00fac \u0111\u1ea9y c\u00e1c thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9. B\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c, b\u1ea1n ng\u1eebng chuy\u1ec3n \u0111\u1ed5i c\u00e1c thanh ghi kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng. Tuy nhi\u00ean, vi\u1ec7c ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng n\u00e0y \u0111i k\u00e8m v\u1edbi m\u1ed9t chi ph\u00ed: \u0111\u1ed9 ph\u1ee9c t\u1ea1p trong vi\u1ec7c x\u00e1c minh th\u1eddi gian.<\/p>\n

              N\u1ebfu b\u1ea1n coi thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 l\u00e0 kh\u00f4ng c\u00f3 th\u1eddi gian, b\u1ea1n c\u00f3 nguy c\u01a1 x\u00e2y d\u1ef1ng m\u1ed9t s\u1ea3n ph\u1ea9m ho\u1ea1t \u0111\u1ed9ng trong ph\u00f2ng th\u00ed nghi\u1ec7m nh\u01b0ng th\u1ea5t b\u1ea1i trong th\u1ef1c t\u1ebf. C\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng nh\u01b0 nhi\u1ec7t \u0111\u1ed9 v\u00e0 dao \u0111\u1ed9ng \u0111i\u1ec7n \u00e1p thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 c\u1ee7a linh ki\u1ec7n \u0111i\u1ec7n t\u1eed. M\u1ed9t thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c \u0111\u1ecbnh th\u1eddi ho\u00e0n h\u1ea3o \u1edf 25\u00b0C c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i \u1edf 85\u00b0C. S\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i t\u00ednh \u0111\u1ebfn nh\u1eefng bi\u1ebfn \u0111\u1ed5i n\u00e0y.<\/p>\n

              H\u01a1n n\u1eefa, b\u1ea3o m\u1eadt l\u00e0 m\u1ed9t m\u1ed1i quan t\u00e2m. C\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng theo th\u1eddi gian khai th\u00e1c th\u1eddi gian m\u00e0 h\u1ec7 th\u1ed1ng c\u1ea7n \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u. N\u1ebfu logic b\u1ea5t \u0111\u1ed3ng b\u1ed9 c\u1ee7a b\u1ea1n r\u00f2 r\u1ec9 th\u00f4ng tin th\u1eddi gian, n\u00f3 c\u00f3 th\u1ec3 b\u1ecb t\u1ed5n th\u01b0\u01a1ng. Hi\u1ec3u r\u00f5 h\u00e0nh vi th\u1eddi gian gi\u00fap b\u1ea1n gi\u1ea3m thi\u1ec3u nh\u1eefng r\u1ee7i ro n\u00e0y.<\/p>\n

              K\u1ebft lu\u1eadn: Th\u1eddi gian l\u00e0 n\u1ec1n t\u1ea3ng \u23f3<\/h2>\n

              Suy ngh\u0129 sai l\u1ea7m r\u1eb1ng thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 l\u00e0 kh\u00f4ng c\u00f3 th\u1eddi gian l\u00e0 di s\u1ea3n c\u1ee7a l\u00fd thuy\u1ebft logic s\u1ed1 h\u1ecdc s\u01a1 khai. K\u1ef9 thu\u1eadt nh\u00fang hi\u1ec7n \u0111\u1ea1i \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c. Th\u1eddi gian kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng; \u0111\u00f3 l\u00e0 m\u1ed9t ngu\u1ed3n l\u1ef1c c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng. D\u00f9 b\u1ea1n c\u00f3 d\u00f9ng \u0111\u1ed3ng h\u1ed3 hay kh\u00f4ng, t\u00edn hi\u1ec7u c\u1ee7a b\u1ea1n ph\u1ea3i tu\u00e2n theo c\u00e1c \u0111\u1ecbnh lu\u1eadt v\u1eadt l\u00fd.<\/p>\n

              S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 ng\u00f4n ng\u1eef c\u1ee7a th\u1ef1c t\u1ea1i n\u00e0y. Ch\u00fang chuy\u1ec3n \u0111\u1ed5i logic tr\u1eebu t\u01b0\u1ee3ng th\u00e0nh c\u00e1c r\u00e0ng bu\u1ed9c v\u1eadt l\u00fd. Ch\u00fang n\u00f3i cho b\u1ea1n bi\u1ebft \u0111i\u1ec1u g\u00ec l\u00e0 kh\u1ea3 thi v\u00e0 \u0111i\u1ec1u g\u00ec l\u00e0 kh\u00f4ng th\u1ec3. B\u1eb1ng c\u00e1ch t\u00f4n tr\u1ecdng nh\u1eefng r\u00e0ng bu\u1ed9c n\u00e0y, b\u1ea1n x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9, hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>\n

              \u0110\u1eebng bao gi\u1edd cho r\u1eb1ng th\u1eddi gian lu\u00f4n \u1edf b\u00ean b\u1ea1n. H\u00e3y \u0111o l\u01b0\u1eddng n\u00f3. Ph\u00e2n t\u00edch n\u00f3. X\u00e1c minh n\u00f3. \u0110\u00f3 l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t nh\u00e0 thi\u1ebft k\u1ebf nh\u00fang chuy\u00ean nghi\u1ec7p.<\/p>\n

              Danh s\u00e1ch ki\u1ec3m tra nhanh cho x\u00e1c minh th\u1eddi gian \u2705<\/h3>\n
                \n
              • B\u1ea1n \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 r\u1ed9ng xung t\u1ed1i thi\u1ec3u cho t\u1ea5t c\u1ea3 c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n ch\u01b0a?<\/li>\n
              • B\u1ea1n \u0111\u00e3 ph\u00e2n t\u00edch c\u00e1c \u0111\u01b0\u1eddng tr\u1ec5 tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t v\u00e0 t\u1ed1t nh\u1ea5t ch\u01b0a?<\/li>\n
              • B\u1ea1n \u0111\u00e3 ki\u1ec3m tra hi\u1ec7n t\u01b0\u1ee3ng b\u1ea5t \u1ed5n \u0111\u1ecbnh trong t\u1ea5t c\u1ea3 c\u00e1c giao c\u1eaft b\u1ea5t \u0111\u1ed3ng b\u1ed9 ch\u01b0a?<\/li>\n
              • B\u1ea1n \u0111\u00e3 t\u00ednh \u0111\u1ebfn \u0111i\u1ec7n dung t\u1ea3i d\u00e2y trong m\u00f4 h\u00ecnh th\u1eddi gian c\u1ee7a b\u1ea1n ch\u01b0a?<\/li>\n
              • B\u1ea1n \u0111\u00e3 x\u00e1c minh thi\u1ebft k\u1ebf \u1edf t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111i\u1ec7n \u00e1p ch\u01b0a?<\/li>\n
              • S\u01a1 \u0111\u1ed3 th\u1eddi gian c\u1ee7a b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt v\u1edbi c\u00e1c thay \u0111\u1ed5i m\u1edbi nh\u1ea5t trong danh s\u00e1ch m\u1ea1ng ch\u01b0a?<\/li>\n
              • B\u1ea1n \u0111\u00e3 ghi ch\u00e9p l\u1ea1i t\u1ea5t c\u1ea3 c\u00e1c gi\u1ea3 \u0111\u1ecbnh li\u00ean quan \u0111\u1ebfn truy\u1ec1n t\u00edn hi\u1ec7u ch\u01b0a?<\/li>\n<\/ul>\n

                Ch\u1ea5p h\u00e0nh c\u00e1c b\u01b0\u1edbc n\u00e0y \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9 c\u1ee7a b\u1ea1n lu\u00f4n g\u1eafn k\u1ebft v\u1edbi th\u1ef1c t\u1ebf, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00fd thuy\u1ebft. N\u00f3 bi\u1ebfn m\u1ed9t \u00fd t\u01b0\u1edfng mang r\u1ee7i ro th\u00e0nh m\u1ed9t gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt \u0111\u00e1ng tin c\u1eady.<\/p>\n","protected":false},"excerpt":{"rendered":"

                Khi c\u00e1c k\u1ef9 s\u01b0 th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang, thu\u1eadt ng\u1eefb\u1ea5t \u0111\u1ed3ng b\u1ed9th\u01b0\u1eddng k\u00edch ho\u1ea1t m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy c\u1ee5 th\u1ec3. Nhi\u1ec1u ng\u01b0\u1eddi cho r\u1eb1ng n\u1ebfu m\u1ed9t thi\u1ebft k\u1ebf l\u00e0 b\u1ea5t \u0111\u1ed3ng b\u1ed9 th\u00ec th\u1eddi gian l\u00e0 kh\u00f4ng quan tr\u1ecdng. H\u1ecd h\u00ecnh dung m\u1ed9t th\u1ebf gi\u1edbi n\u01a1i c\u00e1c t\u00edn hi\u1ec7u thay \u0111\u1ed5i […]<\/p>\n","protected":false},"author":1,"featured_media":1581,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,47],"class_list":["post-1580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"\nThi\u1ebft k\u1ebf b\u1ea5t \u0111\u1ed3ng b\u1ed9: T\u1ea1i sao b\u1ea5t \u0111\u1ed3ng b\u1ed9 kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u1ea7n th\u1eddi gian \u23f1\ufe0f<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 l\u00fd do t\u1ea1i sao thi\u1ebft k\u1ebf nh\u00fang b\u1ea5t \u0111\u1ed3ng b\u1ed9 v\u1eabn c\u1ea7n ph\u00e2n t\u00edch th\u1eddi gian nghi\u00eam ng\u1eb7t. 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